Regular vs Premium Gas

[kojack]

91 all day every car. 87 is piss poor gas and if you dont have en electric motor getting you going you're just gonna burn through more gas when you push the car. Dont flip flop though, use one or the other and let the engine learn the fuel trim. I strongly recommend warming up the engine I find I get way better gas millage when I let my car warm up for quite a while.

87 is no more "piss poor" than 91. it has less octane. If you understand combustion, gasoline and thermodynamics. then, you would realize that for the micra 91 is piss poor. 87 octane makes more power, therefore you will get better gas milage, and also, be heavier in the wallet. Same with my Jeep patriot. 87 gets better milage than 91....why? because it makes more power. Look it up sometime before making blanket statements like piss poor gas if you have no idea what you are talking about.